using the superflat preset customizer, I tried to make to make a superflat preset entirely from chests. However, all of the chests did not render correctly, instead being invisible. Opening them made them appear, but still rendered incorrectly.

the picture below shows my chest superflat world, with the visible brown areas being chests i have manually opened

Hmm, this could be due to the chests not rendering until updated. Not sure if I can do anything to fix this one